System and method for coherent detection with digital signal procession

a technology of digital signal and coherent detection, applied in the field of communication systems, can solve problems such as inability to provide adc with these specifications, and achieve the effect of high spectral efficiency

Inactive Publication Date: 2017-11-21
ZTE (USA) INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach enables high-spectral efficiency and long-distance transmission with reduced ADC bandwidth and sample rate, enhancing receiver sensitivity and overall communication system capacity.

Problems solved by technology

However, an ADC with these specifications may not available.

Method used

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  • System and method for coherent detection with digital signal procession
  • System and method for coherent detection with digital signal procession
  • System and method for coherent detection with digital signal procession

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Embodiment Construction

[0008]Aspects of the present invention employ optical orthogonal frequency division multiplexing (O-OFDM) to transmit signals realizing high-spectral efficiency over long distances.

[0009]FIG. 1 illustrates a schematic diagram of a transmitter and receiver according to aspects of the present invention. A laser 101 generates a continuous lightwave. The laser 101 may be a distributed feedback type laser diode DFB-LD, which may have a wide line width. For a 100 Gbit / s QPSK, a line width smaller than 2 MHz is sufficient. Although line widths greater than 2 MHz may also be sufficient. Alternatively, the laser source 101 may be a tunable external laser with a narrow line width and low phase noise which may be preferred for high level modulation format signals. A multicarrier generator 102 receives the lightwave and generates a multicarrier signal. This multicarrier signal may be generated by a few different schemes. For example, a cascade modulator may be driven by a sinusoidal wave source...

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Abstract

Aspects of the present invention include apparatus and methods for transmitting and receiving signals in communication systems. A multicarrier generator generates a multicarrier signal. An optical demultiplexer separates the multicarrier signal into separate multicarrier signals. At least one QPSK modulator modulates signals from the separate multicarrier signals. An optical multiplexer combines the QPSK modulated signals into a multiplexed signal. The multiplexed signal is then transmitted.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a national stage application (under 35 U.S.C. ยง371) of PCT / US2013 / 25265, filed Feb. 8, 2013, which claims benefit of U.S. Application No. 61 / 597,487, filed Feb. 10, 2012, both of which are incorporated herein by reference in their entirety.FIELD OF THE INVENTION[0002]The field of the present invention is communication systems, and particularly, coherent detection with digital signal procession.[0003]The ever increasing bandwidth demand has been driving communication systems to higher capacities. Therefore, there is a strong motivation to enhance spectral efficiency to increase the total capacity. Employing optical orthogonal frequency division multiplexing (O-OFDM) modulation to transmit signals can realize high-spectral efficiency and long distance transmission. To achieve high receiver sensitivity with coherent detection based on digital signal procession, the bandwidth of the analog to digital converter (ADC) and th...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): H04B10/2507H04B1/50H04B10/548H04B10/50H04L27/20H04L25/03H04J14/02H04L27/26
CPCH04B10/2507H04B10/50H04B10/548H04L27/2096H04L27/2627H04L27/2697H04L27/2601H04L2025/03414H04J14/0298H04L25/03178
InventorYU, JIANJUNLI, JIANQIANGCHIEN, HUNG-CHANGJIA, ZHENSHENG
OwnerZTE (USA) INC